Machine for catching splinters, &amp;c.



No. 69|,344. Patented lan. 2|, |902.

(Application Yled. Sept. 29, 1899.) (No Model.)

Tm: unam: Psfinsco, PHoYuLlTHm wnsnlumon. o, c.

UNITED STATES PATENT FFICE.

ALBERT ABERG, OF PODGORA, AUSTRIA-HUNGARY.

SPECIFICATION forming part of Letters Patent No. 691,344, dated January 21, 1902.

Applicatio'n -liled September 29, 1899. Serial No. 732,108. (No model.)

To all wil/0m it may concern/.-

Be it known that I, ALBERT ABERG, a subject of the King of Sweden and Norway,'re-

'siding at Podgora, Grz, Austria-Hungary,

have invented certain new and Vuseful Improvements in or Relating to Machines for Catching Splintcrs or other Small Fragments of Material, (for which I have made applicafor use in purifying or removing impurities from paper or like pulp, and comprisesa vessel or t-rough in to which the pulp is introduced and a rotating sieve-drum mounted longitudinally in said trough.

The invention particularly relates to the construction of the blades in said sieve-drum whereby important advantages are obtained.

According to this invention the perforated drumis provided with a series of bentplates or blades connected at their sides or edges to the central axle or hub and to the inner surface of the drum, respectively, for the purpose of drawing or sucking the pulp from the trough into the drum.

Hitherto in drums or cylinders having short blades or paddles attached to the inner wall of the rotary drum the sucking'elfect of each blade began at the moment its edge left the level of the pulp in the trough, the pulp thus sucked in running alongthe inner wall. of the drum to the next blade and thence downward,

where it accumulated until it reached the height of the outlet-openings at each end of the drum, whence it flowed out. 1n this way the following disadvantages were manifest: First, the accumulation of pulp reaching up to the cylinder-outlets greatly interferes with the rotatory movement of the cylinder z'. e., requires an excess of driving power to overcome this elfect; secondly, the pulp inside the cylinders is continually being whipped about by the paddles, owing tothe rapid rotation of the cylinder, whereby the'suction-power of the paddles is greatly reduced. These drawbacks are fully remedied by causing the pulp sucked in to flow off, this effect being obtained by continuing the blades, as in the case of turbine blades, to the centralshaft.

The result is that the pulp sucked in from the trough is carried to the discharge-outlets at the cylinder ends by the continuations of the blades serving as conveyer-blades, whereby the accumulation of pulp in the lowest parts of the cylinderis effectually prevented.

In the accompanying drawings, Figure l `represents a cross-sect ion of a pulp-strainerso arranged, and Figs. 2 and`3 constructive modifications of thev blades used in such apparatus. Fig.' 4 shows a sectional view of a coinplete blade in modihed form. y

The trough t is intended to hold the pulp to be treated, and in it is suitably arranged a straining-cylinder c, rotating with its shaft 7c. The pulp drawn in from the trough t by the blades a of the rotating cylinder c is discharged through an outlet h at one end. The construction in the manner of turbine paddles of such combined suction and conveying blades has proved of great advantage whenever tested in practical trials. A falling back of the pulp drawn into the lowest part of the cylinder is prevented, since any portion of the pulp driven against the inner .periphery of the sieve-surface and inclined to adhere there is swept off by other portions striking against it and carried away by the inner parts of the blades serving as conveyers.

In order to prevent a stopping up or clogging of the openings in the sieve-cylinder c in the course of the very rapid discharge at the outlet h of the pulp drawn in, the inner side of the cylinders is kept and swept clear, owing to the special construction of the blades as represented in the accompanying drawings. These blades are provided with nose-shaped projections n, extending in the direction of their length, which are intended, owing to lthe resistance they offer by reason of the acting face of the projection being practically perpendicular to the inner face of the curved wall of the cylinder c, to agitate part of the pulp drawn in, thereby constantly effecting the sweeping clear of the inner side of the cylinder, as described above. The blades extending from end to end may also be provided with perfor-ations, as seen in Figs. 2, 3, and 4. In 2 I show a blade provided with a perforation o, while in Fig.

IOO

o and projection i, partly overlapping the perforati'on o. In Fig. 4 is more clearly shown the arrangement of the perforation o and projection t' relatively to the nose-shaped projection n. In this construction that part of the blade fromthe shaft to the orice Will act as a conveyer and the part from the orifice to the periphery of the cylinder as a suctionblade. The projections t' serve the same purpose as the nozzle-shaped projections n and at the same time prevent the material from passing to any great extent through the openings o, which are provided for the sole purpose of affording the air drawn in at the same timethe opportu nity of escaping into the vnext chamber, and thus obviate the pounding which would be caused bythe compression of air and pulp in thefinterior of the cylinder.

VhatI claim as my invention', and desire to secure by Letters Patent, is-

LPaper and like pulp purifying apparatus, comprising a rotatory straining-cylinder provided Withy bent vblades extending from ,v the inner surface of the cylinder to the central shaft, said blades being provided withl nose-shaped projections n extending from end to end of the blades, substantially as set inder to the inner-surface thereof, and provided with nose-shaped projections extending from end to end of the blades and orifices in said blades, and projections over said oriiices, substantially as described.

Inl testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

, ALBERT Annee. -Witnesses:

' RALPH-MAENYARD, `IIERi\/m.1\u\ BECKER.'

.extending from the central shaft of said cyl- 

